Jahnatal (German pronunciation: [ˈjaːnaˌtaːl], lit. 'Jahna Valley') is a municipality in the district of Mittelsachsen in Saxony in Germany. It was established on 1 January 2023 with the merger of the municipalities of Ostrau and Zschaitz-Ottewig.

Jahnatal is located 8 km (5.0 mi) north of the town of Döbeln and about 17 km (11 mi) south of Riesa, in the valley of Jahna and the surrounding ridges in the north-west of Lommatzscher Pflege.

Jahnatal consists of the following villages (Ortsteile):

On 1 January 2023, the municipalities of Ostrau and Zschaitz-Ottewig merged to form the new municipality of Jahnatal.